Windows implementation of IKeyboard interface

Located in a win subfolder. It uses keyboard hooks to get
key up and down events. Keymapping is done in a separate
windows specific class.

refs #83

src/blackcore/blackcore.pro

@@ -40,6 +40,10 @@ SOURCES += *.cpp
 HEADERS += $$PWD/fsx/*.h
 SOURCES += $$PWD/fsx/*.cpp
 
+win32 {
+    HEADERS += $$PWD/win/*.h
+    SOURCES += $$PWD/win/*.cpp
+}
 
 win32:!win32-g++*: PRE_TARGETDEPS += ../../lib/blackmisc.lib ../../lib/blacksound.lib
 else:              PRE_TARGETDEPS += ../../lib/libblackmisc.a ../../lib/libblacksound.a